Treadmill Gear PM Sintered Part
As a popular fitness tool, the treadmill has a wide range of speed regulation, and the type of working mechanism is a belt drive. Its motor is an important core on the treadmill, and a worm gear box is commonly used. When the motor worm gear meshes and drives, if the relative sliding speed between the meshing gear teeth is large, the friction loss is large and the efficiency is low.
Product Introduction
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Treadmill gear PM sintered part |
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Item |
Material |
Production Process |
Sintering Temperature |
Mold |
Custom |
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treadmill gear |
440c |
Metal Injection Molding |
1550℃ |
To be customized |
Yes |
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Chemical composition |
C ：0.95～1.20 Si： ≤1.00 Mn： ≤1.00 S ： ≤0.030 P ： ≤0.035 Cr：16.00～18.00 Ni：allowed to contain ≤0.60 |
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Available Materials |
Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) |
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Product advantages
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Smoothness |
Dimensional accuracy |
Product density |
Appearance treatment |
Appropriate weight |
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Roughness 1～5μm |
（±0.1%～±0.5%） |
92～95% |
Mirror reflection |
0.03g～400g） |
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Mechanical properties |
Hardness: annealed, ≤269HB; Quenching and tempering, ≥58HRC Mechanical behavior: Internal stress (250 N/mm2) Tensile strength (560 N/mm2) EL(18%) HB(250)
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Heat treatment |
1) Annealing, slow cooling at 800～920℃; 2) Quenching, oil cooling at 1010～1070℃; 3) Tempering, rapid cooling at 100-180°C; 4. Preheating temperature, 649°C-816°C. |
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As a popular fitness tool, the treadmill has a wide range of speed regulation, and the type of working mechanism is a belt drive. Its motor is an important core on the treadmill, and a worm gear box is commonly used. When the motor worm gear meshes and drives, if the relative sliding speed between the meshing gear teeth is large, the friction loss is large and the efficiency is low. Moreover, the relative sliding speed will cause serious wear and heat on the tooth surface. In order to dissipate heat and reduce wear, it is usually necessary to use materials with better noise reduction and wear resistance. The gears specially developed by Zhongwei Precision for the gear transmission part of the motor are made of 440c material, which can effectively reduce the wear and tear of the motor gear, reduce noise, prolong the service life of the treadmill motor and improve product quality.
Gear calculation formula:
Pitch circle diameter d=mz m module z number of teeth
Addendum height ha=ha* m
Dedendum height hf=(ha*+c*)m
Total tooth height h=ha+hf=(z ha*+c*)m
ha*=1, treadmill gear, c*=0.25
Addendum circle diameter dtop=m(z+2)
Root circle diameter droot=m(z-2hf)
The distance between the two arrows in the picture should be t.
After milling spur gears, which measurement methods are commonly used?
Answer: There are three commonly used measurement methods for milling spur gears:
(1) Use a gear vernier caliper to measure the tooth thickness and height of the graduated circular chord of the gear. the
(2) Use a gear vernier caliper to measure the fixed chord tooth thickness and fixed chord tooth height of the gear. the
(3) Measure the common normal length of the gear with a common normal length micrometer.
Modulus series standards are formulated according to the requirements of design, manufacture and inspection. For gears with non-straight teeth, the modulus is distinguished by the normal modulus mn, the end face modulus ms, and the axial modulus mx, and they are based on their respective pitches (normal pitch, The ratio of end face pitch to axial pitch) to pi is also in millimeters.
Some new concepts are introduced - speed, force, torque, friction; and some simple fundamentals of mechanical theory that are less complicated than you might think. This chapter will guide you in recognizing the similarities between a gear and a simple lever.
The two shafts rotate at different speeds. When turning the 8-tooth gear, the 24-tooth gear turns very slowly; while the 24-tooth gear turns, the 8-tooth gear turns very quickly.
First turn the large gear (24 teeth), each of its teeth meshes well with the two teeth of the 8 teeth. When turning 24 teeth, every time a new tooth replaces the previous tooth on the contact surface of the gear, the 8 tooth also turns exactly one tooth, so the large gear turns 8 teeth (24 tooth gear) You can make the pinion rotate a full circle (360 degrees).
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